Water-insoluble monoazo-dyestuffs and process for their manufacture



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United The present invention relates to new water-insoluble monoazo-dyestuffs and to a process for their manufacture; more particularly it relates to Water-insoluble monoazo-dyestufis of the following formula -on R1 o-nnOavn-o o-onr wherein X, R and R represent a hydrogen atom, a halogen atom, an alkyl or alkoxy group, and Y stands for the carbonyl or sulfonyl group.

We have found that valuable, water-insoluble monozodyestuffs are obtained by coupling the diazonium compounds of amines of the general formula Y-NH:

wherein X represents hydrogen, a halogen atom, an alkyl or alkoxy group and Y stands for a CO or S0 group, with coupling components of the general formula wherein R and R represent hydrogen, a halogen atom, an alkyl or alkoxy group.

As diazo components there are preferably used in the process of the present invention metaand para-aminobenzene-sulfonic acid amides or metaand para-aminobenzene-carboxylic acid amides, for example l-aminobenzene-3-carboxy1ic acid amide or 1-aminobenzene-4-carboxylic acid amide, or 1-aminobenzene-3-sulfonic acid amide or l-aminobeneZene-4-sulfonic acid amide, l-amino-2-halogenbenzene-S-carboxylic acid amides or l-amino-2-halogenbenzene-S-sulfonic acid amides, l-amino-Z- alkylbenzene-S-carboxylic acid amides or l-amino-Z-alkylbenzene-S-sulfonic acid amides, 1-amino-2-alkoxybenzene-5-carboxylic acid amides or l-amino-Z-alkoxybem zene-S-sulfonic said amides.

The l-(2,3'-l1ydroxynaphthoylamino)-4-benzoylaminobenzenes of the indicated formula which are used as cou pling components in the process of the present invention are easily accessible by known methods, for example by reacting 2,3-hydroxynaphthoic acid with the corresponding 1-amino-4 benzoylaminobenzenes in a suitable solvent such, for example, as xylene, chlorobenzene, toluene or pyridine, in the presence of a condensation agent such, for example, as phosphorus trichloride.

The dyestuffs can be prepared by known methods, for example by coupling the diazonium compounds with the ,coupling components in an aqueous medium in the presence of a wetting or dispersing agent.

The dyestuffs obtained by the present processare waterinsolu-ble pigments which are distinguished by a good fastness to. solvents. They are. suitable for the preparation of colored lacquers or lake formers, for coloring solutions or products of acetylcellulose, nitrocellulose, natural resins or synthetic resins such as polymerisation or condensation resins, for example, aminoplasts, phenoplasts, and of polystyrene, polyolefins, for example, polyethylene or polypropylene, polyacrycl compounds, polyvinyl compounds, for example polyvinyl chloride or polyvinyl acetate, rubber, casein or silicone resins. They are further suitable for pigment printing on a substratum, especially on a textile fiber, and also on two dimensional structures such as paper. l

The new dyestuffs can also be used for other purposes, for example, in finely divided form for coloring rayon of viscose or cellulose ethers and cellulose esters, polyamides or polyurethanes in the spinning solution or for the coloration of paper.

In comparison with the water-insoluble monoazo-dyestuffs of similar compositions which are known from German Patent 673,082, the dyestuffs obtained by the present process are distinguished by a better fastness to solvents.

Eatample 17.1 parts of 1-amino-2-chlorobenzene-S-carboxylic acid amide are dissolved in the hot with 50 parts by volume of 5 N hydrochloric acid and parts by volume of water and, after the addition of ice, the solution is diazotized at 5 C. with 20 parts by volume of a 5 N solution of sodium nitrite. The diazo solution is clarified and united at 50 C. with an aqueous suspension of 21.7 parts of 1-(2',3'hydroxynaphthoylamino)-2-methyl -4# benzoylaminobenzene which is prepared by dissolving this compound in dilute sodium hydroxide solution and precipitation with glacial acetic acid in the presence of a reaction product from about 20 mols of ethylene oxide and 1 mol 'of octadecyl alcohol. The dyestufi separated after completion of the coupling is filtered with suction, Washed and dried. It is an orange-red powder.

The nitrocellulose lacquers produced with this dyestuff yield a yellowish-red lacquer finish possessing a good fastness to overspraying. By incorporating the dyestuft in polyvinyl chloride, a yellowish-red coloration possessing a very good fastness to bleeding is obtained.

In the following table further components are listed which can be used in the process of the invention, and the tints produced by forming the monoazo-dyestufis from these components in substance.

6 4. The water-insoluble monoazo-dyestufi having the 6. The water-insoluble monoazo-dyestufi having the formula formula 0-NHr CO-NH2 CHaO I CHaO N 1 N II N OH 1 -OH 01 o O--NHQ-NHOOO 0 O-NH- NH-O 00 H] 5. The water-insoluble m-onoazo-dyestuff having the formula References Cited in the file of this patent -G0NH; UNITED STATES PATENTS 01 2,025,582 Fischer Dec. 24, 1935 2,111,890 I Fischer Mar. 22, 1938 N 2,186,226 Zerweck et a1 I an. 9, 1940 l, 2,262,464 Marriott et a1 Nov. 11, 1941 2,742,459 Fischer Apr. 17, 1956 2,899,421 Fischer Aug. 11, 1959 C FOREIGN PATENTS 818,675 France Oct.1,1937 

1. THE WATER-INSOLUBLE MONOAZO-DYESTUFFS HAVING THE FORMULA 